$\int_0^{\infty}\left(axe^{-a}\right)dx$
$\lim_{x\to\infty}\sqrt{\left(x+a\right)\left(x+b\right)}-x$
$-3\left(-9b+4\right)+3$
$e2.25$
$16-\:\frac{x^2}{9}$
$\left(3y-7a\right)\left(5y+8a\right)$
$10x-3+5x$
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